As just about any New Yorker will tell you, the proper way to eat a slice of pizza is by folding it in half length-wise and biting down crust-first. Not only does this seal in the toppings, but also fortifies against any flop. And as it turns out there's a long-standing mathematical theorem that backs up this cheesy slice strategy.
In a video for the Mathematical Sciences Research Institute titled "The Remarkable Way We Eat Pizza," one wacky math-loving Youtuber who goes by "Numberphile" breaks down the theoretic reasoning behind the folding of slices. Numberphile—whose real name is Cliff Stoll—credits German mathematician Carl Friedrich Gauss with the slice-strengthening logic. Gauss's "Theorema Egregium"—or "Remarkable Theorem" for us non-Latin speakers—shows how positive, negative, and zero "curvature" of objects interact with each other.
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"Curvature is an intrinsic property of surfaces," Stoll says, using an orange, banana, and bagel to illustrate Gauss's point. Essentially, the Numberphile shows how object have three kinds of curves: "positive" curvature that go outward, "negative" curvature that go inward, and "zero curvature" along a flat line.